In Korea, there's a League of Legends player called Faker that makes 3Billion won(2.6M dollars) a year.
He's a professional gamer(or esports player) with a whole bunch of sponsors.
What do you think makes it difficult for Pokemon to become a game that handles this much money?
Could Pokemon have "professional" gamers and bigger competitions in the future?

if Rollout/Ice Ball is used on a Pokémon with the Disguise ability during any of the 5 turns, the Rollout counter is increased but the multiplier is not. This multiplier, including the x2 Defense Curl bonus if applicable, will affect the next non-status move even if it isn't Rollout or Ice Ball.

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But... let's return to the topic XD is there some eSport of a Nintendo game? I think there isn't... so maybe it's Nintendo that don't want to have it's games as eSports... (Splatoon 2 can be one eSport but it isn't...) or simply they don't are interested ot don't want to give prize money